20th century climate warming and human disturbance triggered high aquatic production and strong water-column mixing in maar Lake Xiaolongwan, northeastern China

IF 3.3 2区地球科学 Q2 ENVIRONMENTAL SCIENCES Anthropocene Pub Date : 2024-07-06 DOI:10.1016/j.ancene.2024.100442

Luyao Tu , Hongpan Xue , Xin Zhou , Xuanqiao Liu , Paul D. Zander , Tao Huang , Lize Meng , Wangyang Kan , Changchun Huang , Martin Grosjean

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Abstract

Lake ecosystems in northeastern (NE) China are sensitive to global environmental change, and are currently under threats of eutrophication and hypolimnetic anoxia. However, the lack of long-term records of lake production and anoxia in this region makes it difficult to discriminate the impacts of recent anthropogenic activity on lake ecosystems from natural ecosystem variability. This study investigates varved sediments from remote maar Lake Xiaolongwan, NE China and reconstructs high-resolution changes in lake primary production, anoxia, nutrient cycling and catchment processes over the past 1500 years using hyperspectral imaging inferred sedimentary total chlorophyll-a and bacteriopheophytin-a (Bphe-a), combined with sedimentary iron and phosphorus fractions data. Results show that, prior to discernible human impacts in this area from ∼600 CE to 1900 CE, lake primary production was higher during warm periods and reduced during cold periods. Bphe-a records show that hypolimnetic anoxia persisted regardless of temperature variability. Cluster analysis suggests that lake algal communities and biogeochemical conditions in the twentieth-century warm period are unprecedented and significantly different from any other time over the past 1500 years. This phenomenon mostly results from global warming and stronger local catchment disturbance in the early 1900s, combined with atmospheric pollution after the 1950s. Human-driven climate warming has caused stronger seasonal mixing (due to shortened ice-cover duration) and overall better oxygenation in the lake. This study demonstrates clear anthropogenic impacts to lake ecosytems in a relatively pristine region in NE China. We anticipate that our findings will have implications for understanding the status of aquatic ecosystems in NE China under future interacting stressors of anthropogenic climate warming and pollution.

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20 世纪气候变暖和人为干扰引发中国东北小龙湾湖水产高产和水柱强烈混合

中国东北地区的湖泊生态系统对全球环境变化非常敏感，目前正受到富营养化和低渗缺氧的威胁。然而，该地区缺乏湖泊生成和缺氧的长期记录，因此很难区分近期人为活动对湖泊生态系统和自然生态系统变异的影响。本研究调查了中国东北偏远地区小龙湾湖的变质沉积物，并利用高光谱成像推断沉积物总叶绿素-a和细菌叶绿素-a（Bphe-a），结合沉积物铁和磷组分数据，重建了过去1500年间湖泊初级生产、缺氧、营养循环和集水过程的高分辨率变化。结果表明，在公元前 600 年至公元前 1900 年这一地区受到明显的人类影响之前，温暖时期的湖泊初级生产力较高，而寒冷时期则较低。Bphe-a记录显示，无论温度如何变化，下沉缺氧现象一直存在。聚类分析表明，20 世纪温暖时期的湖泊藻类群落和生物地球化学条件是前所未有的，与过去 1500 年的任何其他时期都有显著不同。这一现象主要源于 20 世纪初的全球变暖和更强的局部流域扰动，以及 20 世纪 50 年代后的大气污染。人类驱动的气候变暖造成了更强的季节性混合（由于冰盖持续时间缩短）和湖泊整体含氧量的提高。这项研究表明，在中国东北一个相对原始的地区，人为因素对湖泊生态系统产生了明显的影响。我们预计，我们的研究结果将对了解中国东北地区水生生态系统在未来人为气候变暖和污染等相互作用的压力下的状况产生影响。

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来源期刊

Anthropocene Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.30

自引率

0.00%

发文量

审稿时长

102 days

期刊介绍： Anthropocene is an interdisciplinary journal that publishes peer-reviewed works addressing the nature, scale, and extent of interactions that people have with Earth processes and systems. The scope of the journal includes the significance of human activities in altering Earth’s landscapes, oceans, the atmosphere, cryosphere, and ecosystems over a range of time and space scales - from global phenomena over geologic eras to single isolated events - including the linkages, couplings, and feedbacks among physical, chemical, and biological components of Earth systems. The journal also addresses how such alterations can have profound effects on, and implications for, human society. As the scale and pace of human interactions with Earth systems have intensified in recent decades, understanding human-induced alterations in the past and present is critical to our ability to anticipate, mitigate, and adapt to changes in the future. The journal aims to provide a venue to focus research findings, discussions, and debates toward advancing predictive understanding of human interactions with Earth systems - one of the grand challenges of our time.